I have a ported box that my brother gave me. It is 36 inches long, 12 inches tall. The top width is 9 inches and the bottom is 12 inches. I have tried the bcae1 calculator numerous times and I get an error every single time, so I can't be sure if it is right. The box has two ports in it, and I was wondering if anybody can tell me the volume of each port, or if you can give me the forumla to figure it out. These are all outsite measurements, and the wood is 3/4 " thick. Thanks